Remove description property in RecipePacks resource

[nithyatsu]

@zachcasper raised a concern regarding the presence of a description property in the RecipePacks resource:

> @doc("Description of what this recipe pack provides") 
description?: string; 


Why does RecipePacks have a description property when no other Radius resource have a description? I do not see a use case for why this is needed. It's not used anywhere else in this design.

**Background:**
- The `description` attribute is unique to RecipePacks and not present in other Radius.Core resources.
- We can add it back later, likely for all radius.core resources, as needed.

Requested by: @zachcasper

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Refer to PR #109 for context.